NIUE 1971 BIRDS IMPERF PROOFS ON PRESENTATION CARD
Birds imperforate proof singles, the 20c with much darker wing feathers compared to issued stamps, on Bradbury Wilkinson presentation card inscribed 'as submitted 16.10.70'. Additionally stickered with note requesting changes to green. Unique in this format. Fresh and fine. SG158var-160var; SC139var-141var
